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Re: Vector4 help!

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Bobbybillyhi is not online. Bobbybillyhi
Joined: 10 Apr 2012
Total Posts: 287
09 Oct 2015 01:13 PM
I've been trying to implement supports for various devices into my game, but I do not have the devices to test it. I have mostly been able to work out how to use the support from the Wiki, but it includes minimal information on what a Vector4 is - could you please help!

Thanks!
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Goulstem is not online. Goulstem
Joined: 04 Jul 2012
Total Posts: 7177
09 Oct 2015 01:17 PM
Vector4 is essentially CFrame. A Vector value that includes the rotational values.
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Bobbybillyhi is not online. Bobbybillyhi
Joined: 10 Apr 2012
Total Posts: 287
09 Oct 2015 01:22 PM
Sorry, I'm still not quite getting this, could you give me an example, because, from what I know of ROBLOX, it only tends to work using 3 dimensions, so I'm wondering what this forth one is, and how it works.
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chimmihc is not online. chimmihc
Joined: 01 Sep 2014
Total Posts: 17143
09 Oct 2015 01:26 PM
Vector4 is what uneducated scrubs call CFrames.

Vector2 - 2 numbers forming a vector
Vector3 - 3 numbers forming a vector
Vector4 - 4 numbers forming a vector
CFrame - 12 numbers forming a coordinate frame with position and rotation

See the problem?
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Bobbybillyhi is not online. Bobbybillyhi
Joined: 10 Apr 2012
Total Posts: 287
09 Oct 2015 01:31 PM
Sorry, still not really, because surely some information would be missing from the Vector4, since it only contains 4 values, whereas a CFrame contains 12, like you said.
Could you just give me an idea of how it would work, and what information would be stored where, I don't have a gyroscope enabled phone to test the getDeviceGravity function with.
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Goulstem is not online. Goulstem
Joined: 04 Jul 2012
Total Posts: 7177
09 Oct 2015 01:31 PM
Alright well show me usage of Vector4, and how it is different from CFrame.
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Bobbybillyhi is not online. Bobbybillyhi
Joined: 10 Apr 2012
Total Posts: 287
09 Oct 2015 01:36 PM
I'm getting this as a response to the getDeviceGravity function (I think that's how it's spelled), and I don't know how I would use it to create a force.
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MiniNob is not online. MiniNob
Joined: 14 May 2013
Total Posts: 822
09 Oct 2015 01:39 PM
vector4 is QUATERNION
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Mikesly is not online. Mikesly
Joined: 07 Sep 2007
Total Posts: 4593
09 Oct 2015 01:41 PM
A Vector4 in ROBLOX is a CFrame with a rotation set, i.e. W, X, Y, Z.
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Mikesly is not online. Mikesly
Joined: 07 Sep 2007
Total Posts: 4593
09 Oct 2015 01:46 PM
It's also called a quaternion. I don't know if the order of the Vector4 is (w, x, y, z) or (x, y, z, w), but here's a simplified explanation on it that I found on Unity answers.

"a quaternion is a complex number with w as the real part and x, y, z as imaginary parts.

If a quaternion represents a rotation then w = cos(theta / 2), where theta is the rotation angle around the axis of the quaternion.

The axis v(v1, v2, v3) of a rotation is encoded in a quaternion: **x = v1 sin (theta / 2), y = v2 sin (theta / 2), z = v3 sin (theta / 2)*.

If w is 1 then the quaternion defines 0 rotation angle around an undefined axis v = (0,0,0).

If w is 0 the quaternion defines a half circle rotation since theta then could be +/- pi.

If w is -1 the quaternion defines +/-2pi rotation angle around an undefined axis v = (0,0,0).

A quater circle rotation around a single axis causes w to be +/- 0.5 and x/y/z to be +/- 0.5."
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ChiefAlpha is not online. ChiefAlpha
Joined: 01 Oct 2015
Total Posts: 2014
09 Oct 2015 01:54 PM
AH

MATH
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MiniNob is not online. MiniNob
Joined: 14 May 2013
Total Posts: 822
09 Oct 2015 01:54 PM
a quaternion IS NOT a complex number

a complex number IS a quaternion
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Bobbybillyhi is not online. Bobbybillyhi
Joined: 10 Apr 2012
Total Posts: 287
10 Oct 2015 04:03 AM
Ok, so I looked at the Unity website:
"Vector4s can be implicitly converted to Vector3 (w is discarded)."
So would I just be able to get rid of the 'w' and convert it to Vector3, i.e:

Vector3.new(Vector4.X,Vector4.Y,Vector4.Z)

Or would I need to do something to convert the X,Y,Z from imaginary to real numbers?
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